Process of dyeing cellulose derivatives



' 20 our invention m-aminoacetanilid, havi Patented Nov. 20, 1928.

FFECE.

onnn, AND

OBS T0 GRAS MULLER, or HOCHST-ON-THE SELLI nyns'rnrr' CORPORATION, on NEW ARL ERICH PROCESS OF DYEING CELLULOSE DERIVATIVES.

No Drawing. Application filed December 23, 1925,. Serial No. 77,400, and in German Our present invention relates to a process for dyeing cellulose derivatives, especially cellulose esters or others. For purposes of this invention we will call such cellulose 'derivatives substitute compounds of .the group including cellulose esters and cellulose others. WVe have foundthat for this purpose monoazo dyestuiis,containing as cou-- pling component a monoacyl-meta-phenylenediamine, are eminently suitable. The diazo compounds required for the preparation of the monoazo dyestuffs may be of any kind, but we have found thatjthosediazo compounds which contain more than one sulfo group are unsuitable for the said purpose. The dyestuffs thus obtained dye cellulose esters and ethers tints of good fastness to washing, rubbing and to light.

The following examples serve to illustrate (1) 1 kilo of acetate silk is dyed for to 1 hour at 60 70 C. in a dyebath containing -25 litres in which QOgrams ofthe dyestufi' 2-chlorobenzene-5-sulfonic acid-l-azong most probably the formula: v

NHCOCH1 without the addition h or withoutthe addiloid. The dyeing thus is deep yellow and of are dissolved, with or of a salt oracid or wit tion of a protective col produced on the fibre good fastness.

(2) If the dyestufi mentio going example is replaced quantity of the dyestufl: sulfonic acid:1 azo-maminoacetanilid, a deep golden-yellow tint of good fastness-is 1k is dyed for to obtained on the fibre.

(3) 1 kilo of acetate si lhour at 60-7 C. in a -dyeb'ath of 20-25 litres in which 20 grams of the dyestufi': o-m-aminoacetanilid are the form ofits hydro= ned in-the foreby an equivalent 3-nitrobenzene-4- m n1trobenzene at dissolved, e ther 1n 'eth y January 9, 1925.

chloride or in a colloidal form, with or Without the addition of a salt. In this manner a deep yellow-orange tint'of good 'fastness is 0 obtained. 4

The diazo com going examples other diazo comp napthalene series. may be substituted lid any other acy'lpounds named in the foremay be replaced by any minds of the benzeneand On the other hand, there for the m-aminoacetanim-phenylenediamine capable of being coupled, or homologue or substitution product thereof. As all the dyestuffs in question still contain a free amino group, they may be diazotized on the fibre and subjected in the usual manner to an afterstreatment with the developing agent.

In the following claims We understand by the term monoacyl-meta-phenylenediamine also the homologues and substitution products of this compound.

lVe claim:

' 1'. Processofdyeing compounds of the group including cellulose esters and cellulose ers consisting inusing for the dyeingprocess monoazo dyes obtainable by coupling a diazo .compound containing at the most one sulfo grou phenylenediamine.

'2. Process of dyeing compounds of the group including cellulose esters and cellulose ethers consisting in using for the dyeing process monoazo dyes obtainable by coupling a diazo compound containing at the most one sulfo group with meta-aminoacetamlide.

3. Process of dyeing compounds of the group including cellulose esters and cellulose ethers consisting in 'using for the dyeing process the monoazo dye obtainable bycouv pling diazotized 2-chloro-1-am1nobenzene-5- sulfonic acid with metaaminoa'cetanilide.

4. Compounds of the group including cellulose esters and cellulose ethers dyed with monoazo dyes obtainable by coupling a diazo compound containing at the most one suliio group with a monoacyl-meta-phenylened1- amine. i

5. Compounds of the group including p with a monoacyl-meta- I I cellulose esters and cellulose others dyed with diazotizd 2-chloro-l-amino-benzene 5 sulmonoazo dyes ob ta inable b coupling a. diazo fonic acid with meta-amino-aeetanilide. compound contamlng at t e most one sulfo In testimony whereof, we afiix our signa- 10 group with meta-annnoacetanilide. tures. 5 6. Compounds of. the group including HEINZ EICHWEDE. cellulose esters and cellulose ethers dyed with ERICH FISCHER. J

the monoazo dye obtainable by coupling CARL ERICH MULLER. 

